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Any 1st stage that is factory O2 cleaned and uses O2 compliant lubes and parts will do. You can run the Poseidon Xstream DECO, the Apeks DS4 Nitrox (or the non as well even though they cannot legally publish it), Oceanic O2 Tech Reg, OMS Deco Reg......just to name a few. OR take a reg (almost any reg) and have the cleaning done on it to make it O2 ready.
Second stage is not an issue since it will never be exposed to high pressures of O2.
most regs are already set up for EAN up to 40%...it is still best to have your local dive center check out your reg prior to use, especially if you are using Nitrox regulary, almost all will need servicing more often as O2 can cause quicker deteriation of the internal components....this stands for 1st stage as well as your reg and octo.....most of your information can be found at the manufacturers WEB sites .....
Please advise on first stages that are already set and ready for high O2 mixes.
Accompanying second stage suggestions also important as a complete rig but, as we all know, the first stage is the important bit.
Have you maybe considered doing a search? There is rather an abundance of information already available on this topic.
Also if you find that the members here dont have "any idea" you might consider asking on the decostop. www.thedecostop.com that is a technical board and I am sure you will get some interesting answers to your questions.
Sorry all....my apologies. I know I'm a bit of a sod. My wife says the same.
Hopefully, this will be the right question, with some pre-amble...
I dive "normal" regs...no O2 claims. My question was/is, does anyone have advice comments on regs above 40%
What I was driving at, is, at what point could/would you stop using a standard rig and decide to have a completely O2 clean rig?? And then, what are the best rigs...as in brands...who has the best track record??
I have heard of people using standard gear with 100%. I wouldn't but....anyway, expert comments welcome.